Shop air did not pop my slide seal …BUT - Printable Version
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Shop air did not pop my slide seal …BUT - Gem930 - 12-05-2024
Ok I’m starting another thread about my air system saga that is hopefully less convoluted. First off I got my 120v compressor back on line. It was two separate problems. One, the one way check valve was bad and two… the unloaded solenoid was bad. It is working now (aside from occasionally blowing the 20 amp breaker). My coach has a raised bed slide on the drivers side and a dropping floor slide on the passenger side. Both slides have vacuum systems added to the regulators and two way valves in the lower compartment that switched between regulated pressurized air to fill the seals and vacuum to deflate them. I found one (drivers side - same as was having loud seal leak before ) had a vacuum pump that was blown apart. During trouble shooting the system , I found a piece of teflon tape stuck in the 2 way Parker valve not allowing the valve to completely close in either direction. The valve was open to the vacuum pump during pressurizing the seal and it caused the pump to blow apart. I repaired the valve and the replace the pump and thought all was well…. Until this morning. We spent the night in Reno on our way to California for a late thanksgiving. Woke up this morning and fire up the 60. After few seconds I started to hear air hissing inside the coach. It was coming from under the head board ( just like before). I ran outside and heard air hissing from the seal regulator (drivers side again) in the lower compartment an the passengers side. The regulator was venting heavily, but the pressure read 70 psi. I ran over to the drivers side seal and heard the air hissing (yes over the sound of the engine). I ran back inside and shut the engine off and stabbed the brake several times. The hissing from the rear finally stopped. ( I also learned my low air alarm is not working.) Anyway after I bled the system down with the brake I fired it up again and all was fine???? What the heck. It was below freezing so wondering is some check valve may have froze up. I’m totally confused!!! Any ideas?
RE: Shop air did not pop my slide seal …BUT - Richard - 12-06-2024
Gregg,
Cool weather, not even below 32, combined with wet air flowing through an orifice can form ice. It’s called adiabatic expansion. So with your pump running frequently you may have water in your system.
Second, I don’t use teflon tape for that very reason. It can shred and migrate in the system causing all kinds of havoc at check valves and solenoid valves.
Just to make sure I understand, the regulators for the slide seals are venting excessively when this happens? And the 70 psi you referenced was on the entrance to the regulator OR after the regulator?
RE: Shop air did not pop my slide seal …BUT - folivier - 12-06-2024
You know I can't resist. If teflon tape is properly applied (not over the threads but on the threads themselves) it can't migrate since it's captured by the threads. However teflon goop if applied too judiciously can do the same and is worse to clean out.
Have a nice day!
RE: Shop air did not pop my slide seal …BUT - Richard - 12-06-2024
LOL,
I totally agree with you Forest, either used incorrectly cause problems.
RE: Shop air did not pop my slide seal …BUT - Gem930 - 12-06-2024
As an aircraft owner I’m not a fan of Teflon tape on anything other than a kitchen sink, but I understand there is a correct way to apply it. I was not responsible for any of the the installation, I’m just the guy trying to work through the issues.
The air pressure was indicating 70 psi on the regulator and it was venting like crazy. It appears the regulator is bad, but that is puzzling because I just replaced it. It is a harbor freight regulator I had laying around (still in package) so the chances of it being bad are pretty good. I’m going to get a couple good quality regulators and replace them both.
On a side note, we are parked in front of the in-laws place so I shut of the 12v compressor so as to not upset the neighbors. When we got up this morning, the pressure was zero so I had to fire up the 120V compressor to open the door. Same situation with the slide seal started to occur (over pressure hissing). There must be some kind of relief quiet valve at the seal itself. Anyway, I ran up started tapping the break and it stopped. I’m guessing I just need to exercise the regulator until I get it replaced.
Also, it’s interesting to me that both regulators seem to have their own supply line and running into the compartment. I’m guessing it’s coming from the tank. If there was only one line coming in, I feel like I would like to put a main regulator on it as a safety and then two additional regulators for each individual seal.
RE: Shop air did not pop my slide seal …BUT - Richard - 12-06-2024
When you are replacing the regulators, install a 1/4 turn shutoff in front of the regulator. That will allow you to simulate the pressure rise from zero by closing air to the regulator, building pressure in the coach, and then opening the valve. All in the name of trying to understand what is going on. Hopefully you have NOT pressurized your seals to 70 psi.
RE: Shop air did not pop my slide seal …BUT - Jack Houpe - 12-07-2024
I agree 70 psi will cause problems with a slide seal sort of made my skin crawl reading that. I think you have something else going on can't put a finger on it as I can't see or touch things but you may have a combo of items that in all are leading you down this path.
It was recommended to me from folks here to put quarter turn ball valves on the drains for all the tanks it is a main source of leaks on Newells IMHO and dump the tanks a couple times a year, if you have excessive water in a tank is more than likely the tank that the 120VAC compressor feeds or the first tank off the air dryer.
Not sure if anyone cares but I use teflon tape on some things like high heat items but my go to is teflon pipe dope.
RE: Shop air did not pop my slide seal …BUT - Gem930 - 12-08-2024
A new (not harbor freight) regulator seems to have fixed it…. We will see!